Features of LED aluminum based PCB

The heat dissipation problem of LED is the biggest headache for LED manufacturers, but aluminum substrates can be used. Because aluminum has high thermal conductivity and good heat dissipation, it can effectively export internal heat. The aluminum substrate is a unique metal-based copper clad laminate with good thermal conductivity, electrical insulation properties and machinability. The PCB should also be placed close to the aluminum base as much as possible to reduce the thermal resistance generated by the potting compound.

First, the characteristics of the aluminum based PCB

1. Use surface mount technology;

2. Extremely efficient treatment of thermal diffusion in circuit design;

3. Reduce product operating temperature, increase product power density and reliability, and extend product life;

4. Reduce product size and reduce hardware and assembly costs;

5. Replaces fragile ceramic substrates for better mechanical durability.

Second, the structure of the aluminum based PCB

The aluminum-based copper clad laminate is a metal circuit board material composed of a copper foil, a thermally conductive insulating layer and a metal substrate, and its structure is divided into three layers:

Circuit layer: equivalent to ordinary copper clad laminate board, line copper foil thickness loz to 10oz.

Insulation layer: The insulation layer is a low thermal resistance thermal insulation material.

Base layer: It is a metal substrate, generally aluminum or copper that can be selected. Aluminum-based copper clad laminates and conventional epoxy glass cloth laminates. The circuit layer (that is copper foil) is usually etched to form a printed circuit, so that the various components are connected to each other. In general, the circuit layer is required to have a large current carrying capacity, so that a thick copper foil should be used, and the thickness is generally 35μm - 280μm; thermal conductive insulation layer is the core technology of aluminum substrate. It is generally composed of special polymer filled with special ceramics. It has small thermal resistance, excellent viscoelasticity, anti-heat aging ability, and can withstand mechanical and thermal stress.

The thermal conductive insulating layer of the high-performance aluminum substrate uses this technology to have excellent thermal conductivity and high-insulation electrical insulation properties; the metal base layer is a supporting member of the aluminum substrate, and is required to have high thermal conductivity, generally aluminum plate, also can use Copper plates (where copper plates provide better thermal conductivity), which are suitable for conventional machining process such as drilling, punching and cutting. Aluminum substrate materials have advantages that are unmatched by other materials. Suitable for surface mount technology (SMT) of power components. No need for a heat sink, greatly reduced size, excellent heat dissipation, good insulation and mechanical properties.